Brake



Patented Oct. 15, 1935 p UNITED STATES PATENT OFFICE BRAKE Arthur Willink, United States Army, Philadelphia, Pa.

Original application April 25, 1930, Serial No. 447,391. Divided and this application January 5, 1934, Serial No. 705,386

1 Claim. (Cl. 188-1) (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. G. 757) The invention described herein may be manumechanical friction brake for the power shaft, factured and used by or for the Government for consisting of a worm wheel I4 on the shaft l5 governmental purposes, without the payment to of the control motor meshing with a worm I6 on me of any royalty thereon. the Power shaft 5 This invention relates to a brake and is a The worm gear ng s barely reversible. being 5 division of oopending application, Serial No. close to the critical helix angle Which is pp 447391 of April 25, 1930. mately 10 to 12 degrees depending on the par- The purpose of the present invention is to proticular me al o he gearsvide a brake mechanism employing reversible The torque transmitted from the power motor 10 worm gearing to establish friction and obtain a through t ar n to th nt l s a t m t be 10 balance between a small force and a large force, balanced by e torque of the Control motel D1115 whereby the small force may control the lar e frictional torque inorder to hold the shaft 8 force. I against rotation. With a torque ratio of 40 to 1 With the foregoing and other objects in view, between the power motor and control motor the 15 the invention resides in the novel arrangement ve sib e ge n automatically p v the frie- 15 and combination of parts and in the details of tien necessary to balance the forcesconstruction hereinafter described and claimed, The reversible gearing e e the Power it being understood that changes in the precise tor to take up all friction in the control system. embodiment of the invention herein disclosed The friction pp in the cohtml Shaft acts as may be made within the scope of what is claimed a stabilizer n th n r l and giv sm th per- 20 without departing from the spirit of the invenatien W t practically Zero torquetion. This type of gearing permits the power shaft A preferred embodiment of the invention is to be directly connected to a load without the use illustrated in the accompanying drawing, whereof a Clutch so as to provide manual p in: tion when the source of power fails. The ab- 25 ig. 1 is a View in side elevation of a gun sence of a clutch simplifies resynchronization of equipped with the improved brake mechanism. the system aJfter failure of the electric p Fig. 2 is a plan View of the gear brake, In operation when it is desired to move the Referring to the drawing by character of refthe specified degree and direction of a erence, there is shownagun 5 mounted f r mo lar displacement is transmitted to and repro- 30 ment in elevation on trunnions 6 supported in a dlleed y the receiving meter B of the Selsyn pedestal I. The gun is actuated by an electric y W the meter B turns the W power motor A, capable without overheating, of wheel M the motor A is free to turn the worm l6 delivering a certain specified torque when stalled whi is On the shaft 8 leading to the elevating with the power on. The power shaft 8 of the momechanism of the gun. W the meter B steps 35 tor A has a worm 9 meshing with a worm wheel the shaft 8 is held against further rotation and II] on a shaft ll geared to the elevating arc l2 the motor A is stalled with the power on. of the gun. A handwheel l3 on the end of the I claim:' shaft 8 provides for manual operation. In a brake mechanism, a reversible power mo- 40 A control motor B which is the receiver of a tor having a drive shaft, a worm on said shaft, a 40 self-synchronous system for the transmission of control motor having a shaft adjacent the drive angular motion is placed in the vicinity of the shaft, and reversible worm wheel close to the member whose movements are to be controlled, critical helix angle and meshing with the worm, in the present instance, this member being the said gearin pp y f icti n in h con rol shaft power shaft 8. whereby the control motor balances the power 45 The control motor B is arranged with its axis at motor. right angles to the power shaft 8 and controls a ARTHUR WILLINK. 

